Progress in methods for the separation of rare-earth elements

CONTENTS
I. Introduction 590
II. Fractional crystallisation and fractional precipitation 590
III. Extraction with organic solvents 591
IV. Ion exchange 592
V. Paper chromatography and electrophoresis 594
VI. Method based on differences in rates of ion migration 595
VII. Methods based on valency changes of elements 595
VII. Method based on differences in rates of chloride dehydration 596
VIII. Magnetic method 596
IX. Conclusion 596